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all users are getting outbound email NDRs of "554 5.7.1 unable to relay"

initialit asked
Last Modified: 2010-05-19
We've just relocated and have new IPs for our WAN interface on the firewall.
Nothing has change on our internal scheme of

we are getting the NDR:
You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            <mail.ourdomain.net #5.7.1 smtp;554 5.7.1 <outsideemailaddress@gmail.com>: Relay access denied>

I've checked all the relay settings and authentication and certificates...please not that none of this changed with our move either.

Thanks for the help!
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New IP's for the WAN interface ==> new DNS entries required. Perhaps there has been a slip somewhere and the RDNS isn't working properly.

Is incoming mail arriving OK?


Thanks for the smart host idea...turns out our external spam filter is not properly updating and not letting us relay through them.

Side note, we did have to update RDNS, but had already done that

Thanks for the help!

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